1 /*- 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 static char sccsid[] = "@(#)str.c 8.1 (Berkeley) 6/6/93"; 36 #endif /* not lint */ 37 38 #include <sys/cdefs.h> 39 #include <sys/types.h> 40 41 #include <errno.h> 42 #include <stddef.h> 43 #include <stdio.h> 44 #include <stdlib.h> 45 #include <string.h> 46 #include <ctype.h> 47 48 #include "extern.h" 49 50 static int backslash __P((STR *)); 51 static int bracket __P((STR *)); 52 static int c_class __P((const void *, const void *)); 53 static void genclass __P((STR *)); 54 static void genequiv __P((STR *)); 55 static int genrange __P((STR *)); 56 static void genseq __P((STR *)); 57 58 int 59 next(s) 60 register STR *s; 61 { 62 register int ch; 63 64 switch (s->state) { 65 case EOS: 66 return (0); 67 case INFINITE: 68 return (1); 69 case NORMAL: 70 switch (ch = *s->str) { 71 case '\0': 72 s->state = EOS; 73 return (0); 74 case '\\': 75 s->lastch = backslash(s); 76 break; 77 case '[': 78 if (bracket(s)) 79 return (next(s)); 80 /* FALLTHROUGH */ 81 default: 82 ++s->str; 83 s->lastch = ch; 84 break; 85 } 86 87 /* We can start a range at any time. */ 88 if (s->str[0] == '-' && genrange(s)) 89 return (next(s)); 90 return (1); 91 case RANGE: 92 if (s->cnt-- == 0) { 93 s->state = NORMAL; 94 return (next(s)); 95 } 96 ++s->lastch; 97 return (1); 98 case SEQUENCE: 99 if (s->cnt-- == 0) { 100 s->state = NORMAL; 101 return (next(s)); 102 } 103 return (1); 104 case SET: 105 if ((s->lastch = s->set[s->cnt++]) == OOBCH) { 106 s->state = NORMAL; 107 return (next(s)); 108 } 109 return (1); 110 } 111 /* NOTREACHED */ 112 } 113 114 static int 115 bracket(s) 116 register STR *s; 117 { 118 register char *p; 119 120 switch (s->str[1]) { 121 case ':': /* "[:class:]" */ 122 if ((p = strstr(s->str + 2, ":]")) == NULL) 123 return (0); 124 *p = '\0'; 125 s->str += 2; 126 genclass(s); 127 s->str = p + 2; 128 return (1); 129 case '=': /* "[=equiv=]" */ 130 if ((p = strstr(s->str + 2, "=]")) == NULL) 131 return (0); 132 s->str += 2; 133 genequiv(s); 134 return (1); 135 default: /* "[\###*n]" or "[#*n]" */ 136 if ((p = strpbrk(s->str + 2, "*]")) == NULL) 137 return (0); 138 if (p[0] != '*' || index(p, ']') == NULL) 139 return (0); 140 s->str += 1; 141 genseq(s); 142 return (1); 143 } 144 /* NOTREACHED */ 145 } 146 147 typedef struct { 148 char *name; 149 int (*func) __P((int)); 150 int *set; 151 } CLASS; 152 153 static CLASS classes[] = { 154 { "alnum", isalnum, }, 155 { "alpha", isalpha, }, 156 { "blank", isblank, }, 157 { "cntrl", iscntrl, }, 158 { "digit", isdigit, }, 159 { "graph", isgraph, }, 160 { "lower", islower, }, 161 { "print", isprint, }, 162 { "punct", ispunct, }, 163 { "space", isspace, }, 164 { "upper", isupper, }, 165 { "xdigit", isxdigit, }, 166 }; 167 168 static void 169 genclass(s) 170 STR *s; 171 { 172 register int cnt, (*func) __P((int)); 173 CLASS *cp, tmp; 174 int *p; 175 176 tmp.name = s->str; 177 if ((cp = (CLASS *)bsearch(&tmp, classes, sizeof(classes) / 178 sizeof(CLASS), sizeof(CLASS), c_class)) == NULL) 179 err("unknown class %s", s->str); 180 181 if ((cp->set = p = malloc((NCHARS + 1) * sizeof(int))) == NULL) 182 err("%s", strerror(errno)); 183 bzero(p, (NCHARS + 1) * sizeof(int)); 184 for (cnt = 0, func = cp->func; cnt < NCHARS; ++cnt) 185 if ((func)(cnt)) 186 *p++ = cnt; 187 *p = OOBCH; 188 189 s->cnt = 0; 190 s->state = SET; 191 s->set = cp->set; 192 } 193 194 static int 195 c_class(a, b) 196 const void *a, *b; 197 { 198 return (strcmp(((CLASS *)a)->name, ((CLASS *)b)->name)); 199 } 200 201 /* 202 * English doesn't have any equivalence classes, so for now 203 * we just syntax check and grab the character. 204 */ 205 static void 206 genequiv(s) 207 STR *s; 208 { 209 if (*s->str == '\\') { 210 s->equiv[0] = backslash(s); 211 if (*s->str != '=') 212 err("misplaced equivalence equals sign"); 213 } else { 214 s->equiv[0] = s->str[0]; 215 if (s->str[1] != '=') 216 err("misplaced equivalence equals sign"); 217 } 218 s->str += 2; 219 s->cnt = 0; 220 s->state = SET; 221 s->set = s->equiv; 222 } 223 224 static int 225 genrange(s) 226 STR *s; 227 { 228 int stopval; 229 char *savestart; 230 231 savestart = s->str; 232 stopval = *++s->str == '\\' ? backslash(s) : *s->str; 233 if (stopval < s->lastch) { 234 s->str = savestart; 235 return (0); 236 } 237 s->cnt = stopval - s->lastch + 1; 238 s->state = RANGE; 239 --s->lastch; 240 return (1); 241 } 242 243 static void 244 genseq(s) 245 STR *s; 246 { 247 char *ep; 248 249 if (s->which == STRING1) 250 err("sequences only valid in string2"); 251 252 if (*s->str == '\\') 253 s->lastch = backslash(s); 254 else 255 s->lastch = *s->str++; 256 if (*s->str != '*') 257 err("misplaced sequence asterisk"); 258 259 switch (*++s->str) { 260 case '\\': 261 s->cnt = backslash(s); 262 break; 263 case ']': 264 s->cnt = 0; 265 ++s->str; 266 break; 267 default: 268 if (isdigit(*s->str)) { 269 s->cnt = strtol(s->str, &ep, 0); 270 if (*ep == ']') { 271 s->str = ep + 1; 272 break; 273 } 274 } 275 err("illegal sequence count"); 276 /* NOTREACHED */ 277 } 278 279 s->state = s->cnt ? SEQUENCE : INFINITE; 280 } 281 282 /* Use the #defines isXXX() here, DON'T use them above. */ 283 #include <ctype.h> 284 285 /* 286 * Translate \??? into a character. Up to 3 octal digits, if no digits either 287 * an escape code or a literal character. 288 */ 289 static int 290 backslash(s) 291 register STR *s; 292 { 293 register int ch, cnt, val; 294 295 for (cnt = val = 0;;) { 296 ch = *++s->str; 297 if (!isascii(ch) || !isdigit(ch)) 298 break; 299 val = val * 8 + ch - '0'; 300 if (++cnt == 3) { 301 ++s->str; 302 break; 303 } 304 } 305 if (cnt) 306 return (val); 307 if (ch != '\0') 308 ++s->str; 309 switch (ch) { 310 case 'a': /* escape characters */ 311 return ('\7'); 312 case 'b': 313 return ('\b'); 314 case 'f': 315 return ('\f'); 316 case 'n': 317 return ('\n'); 318 case 'r': 319 return ('\r'); 320 case 't': 321 return ('\t'); 322 case 'v': 323 return ('\13'); 324 case '\0': /* \" -> \ */ 325 s->state = EOS; 326 return ('\\'); 327 default: /* \x" -> x */ 328 return (ch); 329 } 330 } 331